Derrick



T. l. SCANLAN.-

DEHRICK.

APPLICATION FILED DEC. 28. 12H8.

1,3 1 3,74 1 Patented Aug. 19, 1919.

2 SHEETS-SHEET I.

My-SomJw AAYTOHNEK' T. J. SCANLAN.

DEHRICK.

APPLICATION FILED DEc.2a. ma.

1,3 13,741 Patented Aug. 19, 1919 2 SHEETS-SHEET 2.

UNITED STATES PATENT OFFICE.

THOMAS J. SCANLAN, 0F EL PASO, TEXAS.

DERIRICK.

To all whom it may concern Be it known that I, THOMAS J. SCANLAN, a subject of the King of England, residing at El Paso, in the county of El Iaso and State of Texas, have invented certain new and useful Improvements in Derricks, of which the following is a specification.

This invention relates to derricks, and, more particularly, to those which are used on the decks of ships and other vessels.

Ships derricks, in particular, should be as free as possible of cables above deck, due tothe limited space available for operations; further, provision should be made for a wide arc of swing of the boom and for the disposition of the hoisting and fall ropes or cables, so that in the swinging of the boom, there will be no possibility of interference with objects.

My object is to provide a derrick, particularly one adapted for use on shipboard, which will satisfactorilyv `fill these conditions, and others to which a derrick of that character is subject, and to that end I have provided improvements in fittings, construction, relationship, and combination of parts such as are set forth fully hereinafter, shown in the accompanying drawings, and recited in the appended claims.

.One of these improvements comprises a band which is adapted to be positioned at any height on the mast, the band serving asl the means for connecting the boom or booms to the mast; a further improvement resides in the provision of a hollow bolt constituting the pivot for Vthe horizontal swing of the boom and arranged for the passage of the fall and hoist ropes or cables; another improvement ,is a novel {itting to which the heel of the boom is pivoted for vertical movement and which itself is centered on the hollow bolt through which the fall and hoist ropes pass, to providefor the horizontal swing of the boom. These fittings provide a universal joint 1 which enables the boom to be raised or lowered to any desired extent and to be swung around horizontally, without any tangling of the fall and hoisting ropes, and thus the deck is kept clear of these ropes or cables.

Another improvement which I have provided is the arrangement of guide sheaves below the deck or platform, and the provision of hawse pipes or bushings where the ropes pass throughy the deck. Thus, the

Specification of Letters Patent.

Patented Aug. 19, 1919.

Application filed December 28, 1918. Serial No. 268,709.

vention. The disclosure is to be considered as illustrative rather than restrictive of the scope of the invention, as modifications may be resorted to.

In the accompanying drawings,

Figure 1 is a side elevation, certain parts being in section and others broken away, illustrating the invention;

Fig. 2, a horizontal section on line 2'--2 of Fig. l, one of the booms and universal joint being omitted;

Fig. 3, detail view of one of thehollow bolts;

Figs. 4 and 5, detail side and plan views, respectively, of one of the universal joints, and

Figs. 6 and 7 detail side and plan views, respectively, of a band arranged for four booms.

My invention is particularly adapted for use as a ships derrick, but it is not limited to that use as it finds application to any situation where a -derrick may be utilized. The invention is shown and described as being embodied in a two-boom derrick, but it may be carried out in a derrick having any number of booms.

The usualmast is shown at l, the boom or booms at 2, and the deck or platform at 3.

A two-part band 4 secured by bolts 5, en-

ycircles the mast l and may be clamped 4a, said bolt having a head 6a on one end and being secured by a nut 6b screwed ontof its other end. The pairs of eyes 4a are thus reinforced and strengthened and these hol? low bolts G are arranged to serve as guides oipa's'sageways for the fall ropes 7 and hoist ropes 8 controlling the respective booms.

The ropes 7 and 8 for each boom Zpass through the hollow bolt which constitutes the axis of rotation for horizontal movement of the given boom. c

, lead to the hoisting'gwinch.` Thus, the up-V per surface of the deck 3 is entirely clear of ropes used to operate the booms. y A Y Referring to Figs, 4 and 5, universal joints 18 are provided forthe booms '2, said joints comprising nietal fittings having a.

horizontal; eye crear 14 'which is mounted to swing horizontall'ylontle bolt 6, and a bifurcated portion 15 which receives the iiatmetal heel 1,5 ofthe boom and to which c said heel is pivoted Aon a bolt 17. Thefitting or `joint 18 has arms 18y which carry, on a bolt 19a centeringsheave 20 over which thehoist rope 8 passes. Thesheave 2O is of such size and; s'o disposedfthatits periphery is arranged above 'the hollow interior ofthe boltl 6 and, .consequently, the hoist rope 8 runs direct from said sheave y"to tlefslreave 11, without touching the walls ofV either the hollow bolt 6 or thehawse pipe 10.

, yThe eyie 14 allows the boom to swing 'horif z'ont'ally and 'thep'ivot bolt 17 is the pivotal pointfor the rise and'falllof'the boom. c The horizontal swing an'dfri's'e and fall ofthe boom'may, therefore, be carried out'withosut in any manner tangling the l'ropes or cables 7 and 8. In vsetting the band 4 on the 'mast l, the eyes 4% and bolts-will be arranged vertically in linewi'th tlehawse pipfeslO.

c Tte 'europee 7 am to the usual tiene 21 atftheftop ofthe mast', thence to blocks or sl'laves 22 at the peaks of the booms.v f

Iarran'ge the Asheaves `for the hoistl ropes 8 centrallyin slots in the peak offftlie boom, 'as shown at 2:3.Y The hoist ropes e are thus made to C jrunj'direot from theV vcentering sheaves 2O tothe peak sheaves 23, and, being y,above the booms, they 'are not only out 'of the way, but have a ltendency to sustain the load. The usual `grapple blocks 247./are pro vide l.` V

waaraan is:

l'. A drrikcomprising va mast, a liitting whichis pivoted to the mast to swing horizontally in relation thereto, a boom pivoted to the fitting so that it may be raised or lowered and will also swing with the fitting,

the vertical pivotal connection between the fitting and the mast being hollow, and fall and hoist ropes for the boom which pass downwardly through the hollow pivotal connection aforesaid.

2. In a derrick, the combination with a mast, of a clamp band adapted to'be Secured to the mast at different heightsthereof, said clampv 4band having aj vertically arranged Y eye, a tting having a horizontally arranged eye, a hollow bolt arranged vertically and' constitu-ting a pivotal connection between the two eyes aforesaid, whereby the fitting may swinghorizontally, a boom having a horizontal pivotal connection with the fitthe two eyes aforesaid, whereby'thelfitting V 4 may swing horizontally, a'lboom` .havingfa horizontal pivotal connection with the ntting, a centering 'slie'avejc'arried "the'fltting, a'h'oist rope fortheboon'i which passes through the hollow boltfand'a4 fall rope'for the boom which passes/downwardly through the' renew toitvv l *I 4. ln a derrick, the combination with a ma providedv with a warranty Vaia-iigai hollow 'pivot bolt, 'of'a booin having apifv otal fconnection wi-thsaid hollow bolt, and fall and hoist ropes passing downwardly through said hollow bolt; V

5'. In a "'derrick, the combination with a mast, anda hollow verticallydisposedipivot b'olt Isecured thereto, of agfittin'gmounted on 5 lsaid hollow ib'oltto swing horizont'all" In felation to the-maa and protvfdeawaira tirureatsd 'portier-11, a bom havtnga neel received in the bi'furcated portion aforesaid and pivoted thereto on ahoriz'o'irtalconnection, a centering' sheave icarried' by thejf'fiftpasses downwardly throughftlie rita1 try ua 'emersa a @imp band *y fon the mast 'vw/inailL is adapted to lte moved up or down or therearound priorto being clamped, a hollow bolt carried by the band and arranged in vertical alinement with the hawse pipe, a boom having a pivotal connection with the hollow bolt, and hoist and fall ropes for the boom which pass downwardly through the hollow bolt and the hawse pipe and around the sheaves below the deck or platform.

7. In a derrick, the combination with a deck or platform having a hawse pipe ex tending therethrough, of a bracket secured below the deck or platform, sheaves carried by the bracket, a mast, a clamp band on the mast which is adapted to be moved up or down or therearound prior to being clamped, said band having a pair of vertically alined eyes, a hollow bolt located in said eyes, a fitting having a horizontal eye which is located between the eyes on the band and is mounted on the bolt, a sheave carried by the said fitting, a boom having a heel which is pivoted to the fitting on a hori Zontal bolt, and hoist and fall ropes for the boom which pass downwardly through the hollow bolt and the hawse pipe and around the sheaves below the deck, the hoist rope also passing over the sheave carried by the fitting.

8. In a derrick, the combination with a mast, of a fitting pivoted thereto, a boom pivoted to the fitting, a peak sheave located centrally within the boom near the peak thereof, a fall rope for the boom, a centering sheave carried by the fitting and located above the pivotal connection of the boom with the fitting, and a hoist rope passing over the centering sheave and thence to the peak sheave aforesaid.

In testimony whereof I affix my signature.

THOMAS J. SCANLAN.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C. 

